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/* the Music Player Daemon (MPD)
* Copyright (C) 2008 Max Kellermann <max@duempel.org>
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "notify.h"
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
int set_nonblock(int fd)
{
int ret;
assert(fd >= 0);
ret = fcntl(fd, F_GETFL, 0);
if (ret < 0)
return ret;
return fcntl(fd, F_SETFL, ret|O_NONBLOCK);
}
int initNotify(Notify *notify)
{
int ret;
ret = pipe(notify->fds);
if (ret < 0)
return -1;
ret = set_nonblock(notify->fds[1]);
if (ret < 0) {
close(notify->fds[0]);
close(notify->fds[1]);
return -1;
}
return 0;
}
int waitNotify(Notify *notify)
{
char buffer[64];
ssize_t nbytes;
nbytes = read(notify->fds[0], buffer, sizeof(buffer));
return (int)nbytes;
}
int signalNotify(Notify *notify)
{
char buffer[1] = { 0 };
return (int)write(notify->fds[1], &buffer, sizeof(buffer));
}
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